libstdc++-v3/testsuite/23_containers/unordered_set/allocator/noexcept.cc

// Copyright (C) 2013-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-do compile { target c++11 } }

#include <unordered_set>
#include <testsuite_allocator.h>

struct T { int i; };

struct hash
{
  std::size_t operator()(const T t) const noexcept
  { return t.i; }
};

struct equal_to
{
  bool operator()(const T& lhs, const T& rhs) const noexcept
  { return lhs.i == rhs.i; }
};

// Versions of the function objects without nothrow swap.
struct hash_t : hash { };
void swap(hash_t&, hash_t&) noexcept(false) { }
struct equal_to_t : equal_to { };
void swap(equal_to_t&, equal_to_t&) noexcept(false) { }

using __gnu_test::propagating_allocator;

void test01()
{
  typedef std::allocator<T> alloc_type;
  typedef std::unordered_set<T, hash, equal_to, alloc_type> test_type;
  test_type v1;
  test_type v2;
  // this is a GNU extension for std::allocator
  static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
}

void test02()
{
  typedef std::allocator<T> alloc_type;
  typedef std::unordered_set<T, hash_t, equal_to, alloc_type> test_type;
  test_type v1;
  test_type v2;
  static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  static_assert( !noexcept( v1.swap(v2) ), "Swap can throw" );
}

void test03()
{
  typedef std::allocator<T> alloc_type;
  typedef std::unordered_set<T, hash, equal_to_t, alloc_type> test_type;
  test_type v1;
  test_type v2;
  static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  static_assert( !noexcept( v1.swap(v2) ), "Swap can throw" );
}

void test04()
{
  typedef propagating_allocator<T, false> alloc_type;
  typedef std::unordered_set<T, hash, equal_to, alloc_type> test_type;
  test_type v1(alloc_type(1));
  test_type v2(alloc_type(2));
  static_assert( !noexcept( v1 = std::move(v2) ), "Move assign can throw" );
  static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
}

void test05()
{
  typedef propagating_allocator<T, true> alloc_type;
  typedef std::unordered_set<T, hash, equal_to, alloc_type> test_type;
  test_type v1(alloc_type(1));
  test_type v2(alloc_type(2));
  static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
}

void test06()
{
  typedef std::unordered_set<int> test_type;
  static_assert( noexcept( test_type() ), "Default constructor does not throw" );
  static_assert( noexcept( test_type(test_type()) ), "Move constructor does not throw" );
}